Workaround 2

Start the Windows 10 virtual machine and wait until it completes loading and wait up to 30 minutes.
The reason behind these actions is that Windows could finish performing background maintenance resulting in the issue resolution.

If the first step hasn't helped, from the top menu bar select Actions> Stop, once prompted, click the Stopbutton.

Start the Windows 10 virtual machine again and wait up to ~30 minutes.

Make a manual backup of the VM (if not enough room on Mac, take a snapshot via Actions > Take Snapshot).

Start Windows 10 and right after go to Actions > Reset.

Repeat reset procedure 2-3 times until Windows shows 'Preparing Automatic Repair' (unfortunately, this is now the easiest way to get to safe mode).NOTE: The most effective way would be to do it when Windows is loading system files, when a spinning indicator with Windows logo is shown.

If yes, then one of the 3rd-party programs causes Windows boot issue. Revert to snapshot to safe mode and disable one 3rd-party program at a time and reboot to check. Once the conflicting software is determined, contact the program development/support for further troubleshooting. Additionally, a name of the program can be shared on Parallels forum. By sharing the program name you'll help other affected people to resolve the issue. If a lot of people contact the same vendor/manufacturer with a similar issue it would be easier to prioritize the issue resolution.

If Windows yet does not boot even after disabling all 3rd-party programs, use system restore points to recover Windows (Wait until Windows shows 'Automatic Repair' dialog. Select 'Advanced options' > Troubleshoot > Advanced options > System Restore). You can also reset Windows as a last resort option ('Reset this PC' at 'Troubleshoot' section).

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